polar diameter of Earth

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• Earth — This article is about the planet. For other uses, see Earth (disambiguation). Earth   …   Wikipedia

• earth — /errth/, n. 1. (often cap.) the planet third in order from the sun, having an equatorial diameter of 7926 mi. (12,755 km) and a polar diameter of 7900 mi. (12,714 km), a mean distance from the sun of 92.9 million mi. (149.6 million km), and a… …   Universalium

• Polar desert — Polar deserts are areas with annual precipitation less than 250 millimetres and a mean temperature during the warmest month of less than 10° C. Polar deserts on Earth cover nearly 5 million square kilometres and are mostly bedrock or gravel… …   Wikipedia

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

• Earth's orbit — In astronomy, The Earth s Orbit involves the Earth orbiting the Sun at an average distance of about 150 million kilometers every 365.2564 mean solar days (1 sidereal year). From Earth, this gives an apparent movement of the Sun with respect to… …   Wikipedia

• Polar Satellite Launch Vehicle — Infobox Rocket name = Polar Satellite Launch Vehicle caption = PSLV C8 (CA Variant) carrying the AGILE x ray and γ ray astronomical satellite of the ASI lifting off from Sriharikota function = Expendable launch vehicle manufacturer = ISRO country …   Wikipedia

• Other moons of Earth — This article is about the scientific search for other moons of Earth. For Lilith, Earth s second moon in astrology, see Lilith (hypothetical moon). Earth with two moons Claims have existed for many centuries that the Earth might possess other… …   Wikipedia

• compression of the earth — The ratio of the difference between the equatorial and polar radii to the equatorial radius. Its value is approximately 1/297 the difference between the equatorial and polar diameter is about 27 miles …   Aviation dictionary

• Risks to civilization, humans and planet Earth — This article is about the near and very far future. For past civilizations, see Societal collapse. Contents 1 Types of risks 2 Future scenarios 2.1 …   Wikipedia

• North Polar Basin (Mars) — Not to be confused with Vastitas Borealis. North Polar Basin The North Polar Basin is the large blue low lying area at the northern end of this topographical map of Mars. Its elliptical shape is partially obscured by volcanic eruptions (red,… …   Wikipedia

• Rare Earth hypothesis — In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the emergence of complex multicellular life (metazoa) on Earth required an improbable combination of astrophysical and geological events and circumstances. The term… …   Wikipedia